CN214898283U - Circuit breaker with high arc extinguishing performance - Google Patents
Circuit breaker with high arc extinguishing performance Download PDFInfo
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- CN214898283U CN214898283U CN202120755583.4U CN202120755583U CN214898283U CN 214898283 U CN214898283 U CN 214898283U CN 202120755583 U CN202120755583 U CN 202120755583U CN 214898283 U CN214898283 U CN 214898283U
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Abstract
The utility model discloses a circuit breaker with high arc extinguishing performance, which comprises an arc extinguish chamber, wherein an upper arc striking piece, a movable contact rod and a connecting rod are arranged in the arc extinguish chamber and are connected to form an equipotential, one end of the connecting rod is connected with the upper arc striking piece, the other end of the connecting rod is connected with a wire outlet row, and the connecting point is an arbitrary point between the movable contact rod and a circuit of the wire outlet row; the utility model discloses an increase equipotential device in the arc extinguishing system, can promote the utilization ratio of the grid piece quantity of explosion chamber under the prerequisite that does not change the contact opening distance, guarantee that more grid pieces can play the cutting action to electric arc, promote the arc extinguishing performance of product.
Description
Technical Field
The utility model relates to a low-voltage apparatus technical field, concretely relates to circuit breaker with high arc extinguishing performance.
Background
The longer the existing time of the electric arc is, the more serious the burning loss of the contact is caused to the breaker in the breaking process, thereby causing the damage of a circuit system and personal safety. The arc extinguishing system is used as a core component of the circuit breaker, and the cutting and extinguishing of the arc can directly influence the characteristics of the circuit breaker, such as success or failure of breaking of a fault circuit, service life of the circuit breaker and the like.
Based on this, in order to effectively promote the arc extinguishing performance of circuit breaker, need set up more quantity's bars piece in the explosion chamber, but along with the quantity increase of bars piece, how effectively to improve the utilization ratio of bars piece, let every a bars piece can both successfully cut electric arc become the problem that needs to solve urgently.
In the prior art, aiming at a direct-current high-voltage product, a multi-pole series connection mode is usually adopted to ensure that more grid pieces are cut by electric arcs, if the arrangement height of the grid pieces in a one-pole arc extinguish chamber exceeds the opening distance of a movable contact and a fixed contact, the electric arcs are difficult to enter the upper grid pieces, the production cost is undoubtedly increased, and more position spaces need to be reserved for a circuit breaker when a client uses the circuit breaker.
The moving contact and the static contact are used as conductive contacts, and the burning loss of the contacts is greatly influenced by the transfer speed of arc roots of the electric arc. With the concern of critical current and electrical life indicators in GB14048.2, it is therefore desirable to design a contact system that allows rapid arc transfer. In the conventional structure, the arc root moves along the surface of the conductor toward the arc-extinguishing chamber, and the arc root transfer speed is slow because the arc root moves depending on the shape of the surface of the conductor, the manufacturing quality, and the like.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: in order to overcome the defects of the prior art, the utility model provides a circuit breaker with high arc extinguishing performance has solved the problem that the arc root transfer speed is slow, the arc extinguishing effect is poor.
The technical scheme is as follows: the circuit breaker with high arc-extinguishing performance comprises an arc-extinguishing chamber, wherein an upper arc striking plate, a movable contact rod and a connecting rod are arranged in the arc-extinguishing chamber; the upper arc striking piece and the movable contact rod form an equipotential circuit through connection, one end of the connecting rod is connected with the upper arc striking piece, the connection point of the other end of the connecting rod is any part between the movable contact rod and the outgoing line row circuit, the parts of the movable contact rod and the outgoing line row circuit are an outgoing line row, a switching row and a conductive clamping piece, the outgoing line row, the switching row and the clamping piece are sequentially and fixedly connected, and the clamping piece is installed with the movable contact rod.
The effect of connecting rod is equipotential device, can promote the utilization ratio of the bars piece quantity of explosion chamber under the prerequisite that does not change the contact opening distance, guarantees that more bars pieces can play the cutting effect to electric arc, promotes the arc extinguishing performance of product. After the movable contact part and the fixed contact part of the circuit breaker are separated, electric arcs are generated between the movable contact and the fixed contact, but due to the fact that the number of arc-extinguishing grid pieces is limited in the effective separation range of the fixed contact and the movable contact, the situation that the arc-extinguishing effect is poor exists in the grid pieces which are higher than the upper portion of the movable contact, and therefore the high efficiency of the arc-extinguishing grid pieces can be improved through the equipotential arc-striking device.
The electric arc return circuit of the equipotential device has two, when the moving contact begins to separate, the first formed equal circuit return circuit is the outlet row, the transfer row, the moving contact rod and the moving contact, namely the equipotential return circuit 2; along with the movement of the movable contact, the electric field intensity between the movable contact and the fixed contact is gradually weakened, when the distance L2 between the movable contact and the fixed contact is less than L1(L1 is the minimum distance between the upper arc striking piece and the lower arc striking piece), the electric field intensity between the movable contact and the fixed contact is less than the electric field intensity between the upper arc striking piece and the lower arc striking piece in front, therefore, the arc root of the arc rotation is transferred to the upper arc striking piece and the lower arc striking piece, an equipotential loop 1 is formed, the voltage formed by the upper arc striking piece and the outgoing line are arranged in an equipotential manner, therefore, the upper arc striking piece can establish a stronger electric field, and the arc extinguishing grid piece above the movable contact is ensured to be utilized.
Further, the method comprises the following steps:
the connecting rod can be bent for whole copper, also can be that both ends are the copper, and the intermediate conductor is flexible conductor's mode, its the utility model discloses do not make the restriction to the concrete structure of connecting rod.
Further, the method comprises the following steps:
the upper arc striking plate comprises a connecting part, the connecting part is fixed above the uppermost grid plate of the arc extinguishing grid plate group, a first arc striking rod is arranged along one side of the connecting part in an extending mode towards the lower portion of the connecting part, a second arc striking rod is arranged along the opposite direction of the end portion of the first arc striking rod in an extending mode, and the first arc striking rod and the second arc striking rod form a V shape.
Further, the method comprises the following steps:
the movable contact switch further comprises a lower arc striking piece, a bulge facing the upper arc striking piece is arranged on the lower arc striking piece, and the minimum distance between the movable contact and the fixed contact is L under the condition that the movable contact rod rotates upwards to be switched off2The minimum distance between the top end of the protrusion and the V-shaped lower end of the upper arc striking plate is L1And L is2＜L1。
L2＜L1The arc root is favorable to being transferred from the driven and static contacts to the upper and lower arc striking plates, thereby reducing the burning loss of the moving and static contacts and prolonging the service life of the circuit breaker.
Further, the method comprises the following steps:
the first arc striking rod comprises an upper rod extending downwards from one side of the connecting part, a bend which is connected with the upper rod and has a certain angle with the tail end of the upper rod, and a lower rod which is connected with the bend and extends downwards, wherein the bend is arranged on the first arc striking rod close to the upper end of the arc extinguishing grid group.
Further, the method comprises the following steps:
the side wall of the base is provided with a groove, and the connecting rod is arranged in the groove.
The wiring groove is formed in the base, the connecting rods are all buried in the groove, the conductive connecting rods are not allowed to be exposed outside the shell, and therefore the insulation problem is solved.
Further, the method comprises the following steps:
the number of the arc extinguishing grid pieces in the arc extinguishing grid piece group is 50-60.
Has the advantages that: compared with the prior art, the utility model, it is showing the advantage and is: (1) the utility model discloses an increase equipotential device in arc extinguishing system, can promote the utilization ratio of the grid piece quantity of explosion chamber under the prerequisite that does not change the contact opening distance, guarantee more grid piecesThe arc cutting device can cut the arc, and improve the arc extinguishing performance of the product; (2) after the movable contact is opened, the movable contact and the static contact are opened, and the minimum distance between the movable contact and the static contact is L1The minimum distance between the upper arc striking piece and the lower arc striking piece is L2Satisfy L2Less than L1The arc root is beneficial to being transferred from the driven and static contacts to the upper and lower arc striking pieces, so that the burning loss of the movable and static contacts is reduced, and the service life of the circuit breaker is prolonged; (3) the wiring groove is formed in the base, and the problem of product insulation caused by equipotential devices can be solved by wiring the shell of the circuit breaker.
Drawings
Fig. 1 is a schematic view of an overall structure of a circuit breaker according to the present invention;
fig. 2 is a schematic diagram of a closing state of the circuit breaker according to the present invention;
fig. 3 is a schematic diagram of the opening state of the circuit breaker according to the present invention;
fig. 4 is a schematic view of an arc extinguishing chamber component according to the present invention;
fig. 5 is a plan view of an arc chamber component according to the present invention;
fig. 6 is a functional schematic diagram 1 of an equipotential circuit according to the present invention;
fig. 7 is a functional schematic diagram 2 of an equipotential circuit according to the present invention;
fig. 8 is a schematic view of the installation of the connecting rod according to the present invention;
fig. 9 is a cross-sectional view of the connecting rod on the base according to the present invention;
fig. 10 is a front view of the connecting rod of the present invention on the base;
fig. 11 is a schematic structural view of an upper arc runner according to the present invention.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope covered by the technical content disclosed in the present invention without affecting the function and the achievable purpose of the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
In a molded case circuit breaker, each pole has at least one fixed contact portion and at least one movable contact portion, the fixed contact portion and the movable contact portion are connected or disconnected with each other when the circuit breaker is closed or opened, and an arc extinguishing device and a set of operating mechanism are provided, the operating mechanism is mainly used for controlling the contact and separation of the movable contact portion and the contact portion, and the arc extinguishing device is used for extinguishing an arc generated when the movable contact portion is separated from the fixed contact portion.
The utility model relates to a fixed contact part, movable contact part and arc control device of this type circuit breaker are shown as in figure 1, and the circuit breaker includes upper cover 9, base 10 and sets up connecting rod and contact arc extinguishing system promptly at the equipotential connecting device on base 10.
The circuit breaker comprises an arc extinguish chamber, wherein an upper arc striking plate 6, a movable contact rod 4 and a connecting rod 3 are arranged in the arc extinguish chamber; the upper arc striking plate 6 and the movable contact rod 4 form an equipotential circuit through connection, one end of the connecting rod 3 is connected with the upper arc striking plate 6, the connection point of the other end of the connecting rod is any part between the movable contact rod 4 and the circuit from the outgoing line row 1, the parts from the movable contact rod (4) to the circuit from the outgoing line row 1 are the outgoing line row 1, the switching row 2, the clamping piece 10-1 and the movable contact rod (4), the outgoing line row 1, the switching row 2 and the clamping piece 10-1 are sequentially and fixedly connected, and the clamping piece 10-1 and the movable contact rod 4 are installed.
That is, the other end of the connecting rod 3 may be mounted on any one of the parts between the outlet wire row and the circuit formed by the moving contact rod. The upper arc striking plate 6 and the movable contact rod 4 can form an equipotential circuit only by connection.
Further, in the embodiment of the present invention, an outlet bar 1 is installed in the base 10, one end of the outlet bar 1 is provided with a switching bar 2, a movable contact rod 4 is fixed on the switching bar 2, a conductive clamping member 10-1 is further provided between the switching bar 2 and the movable contact rod 4, and the movable contact rod 4 rotates at a fixed point, the front end of the movable contact rod 4 is provided with a movable contact 41, along with the rotation of the movable contact rod 4, the movable contact 41 and the stationary contact 51 are separated or abutted, an arc extinguishing grid set 7 is installed on the other side in the base 10 corresponding to the outlet bar 1, an upper arc guiding sheet 6 is provided on the arc extinguishing grid set 7, a connecting rod 3 is surface-mounted on the upper arc guiding sheet 6, the other end of the connecting rod 3 is fixed on the outlet bar 1, and the connecting rod 3 is conductive. The number of the arc-extinguishing grid pieces in the arc-extinguishing grid piece group 7 is 50-60.
Further, in the embodiment of the present invention, one end of the connecting rod 3 is installed on the upper arc-striking plate 6, and the other end is fixed on the switching row 2, so that when the arc root of the arc rotation is transferred to the upper and lower arc-striking plates, the voltage formed by the upper arc-striking plate and the switching row 2 are equipotential, correspondingly, one end of the connecting rod 3 can also be installed on the upper arc-striking plate 6, and the other end is fixed on the clamping piece or the movable contact rod.
In this embodiment, the connecting rod 3 may be a bent copper plate, or may be a flexible conductor with two ends serving as copper plate intermediate conductors, and this embodiment is not limited to a specific structure thereof as long as equipotential connection can be achieved.
The following and the attached drawings take the example that one end of the connecting rod is arranged on the upper arc striking plate, and the other end of the connecting rod is fixed on the wire outlet row, and the connecting principle of the connecting rod and other components is the same.
The equipotential connecting device comprises an outgoing line bar 1, a conductive clamping piece 10-1, a movable contact rod 4, a connecting rod 3 and an upper arc striking sheet 6, wherein the outgoing line bar 1 is fixed on a base 10 through screws, the other end of the outgoing line bar 1 is fixed with a conductive switching bar 2 and the conductive connecting rod 3 through screws, the other end of the conductive switching bar 2 is connected with the conductive clamping piece 10-1 through screws, and the conductive clamping piece 10-1 is connected with the movable contact rod 4 through hole shaft matching. In order to make full use of the grid pieces above, an equipotential connecting device is added, so that the arc voltage can be rapidly increased, and the arc extinguishing effect of the circuit breaker is improved.
The closing and opening working states of the specific circuit breaker are shown in fig. 2 and fig. 3, fig. 2 is a closing state of the circuit breaker, at this time, a movable contact part and a fixed contact part are in a contact state, a complete conductive loop can be formed, a device formed by the conductive loop comprises a wire outlet bar 1, a conductive switching bar 2, a conductive clamping piece 10-1, a movable contact part and a fixed contact part, the movable contact part mainly comprises a movable contact bar 4 and a movable contact 41 fixed on the movable contact bar 4, the movable contact bar and the movable contact 41 are fixed in a welding mode, the fixed contact part mainly comprises a fixed contact bar 5, a fixed contact 51 and a lower arc striking plate 8, wherein the fixed contact bar 5 is fixed with a base 6 through a screw, the fixed contact 51 and the fixed contact bar 5 are fixed through welding, and the lower arc striking plate 8 and the fixed contact bar 5 through welding. One end of the lower arc striking plate 8 is arranged below the lowermost grid plate of the arc extinguishing grid plate group 7, the other end of the lower arc striking plate is provided with a static contact rod 5, and the static contact 51 is fixed on the static contact rod 5.
Fig. 3 shows the circuit breaker in the open state, in which the movable contact part is separated from the fixed contact part by the operation mechanism, and the air is broken down by the voltage and current, so that when the movable contact part moves to the maximum position, an arc exists between the fixed contact 51 and the movable contact 41, and then the arc is extinguished by the action of the arc extinguishing chamber.
The layout and installation of the arc extinguish chamber can be better understood through the drawings of fig. 4 and 5, wherein fig. 4 is a layout of arc extinguish chamber components, the arc extinguish chamber mainly comprises an insulating plastic part 11-1, a fixed side plate 11-2, an upper arc striking plate 6 and an arc extinguishing grid plate 7, notches are formed in two sides of the fixed side plate 11-2 and used for being riveted and fixed with the arc extinguishing grid plate 7, the plastic part 11-1 and the side plate are fixed through hot riveting, and the upper arc striking plate 6 is connected with the insulating plastic part 11-1 through screws. The side plate 11-2 of the arc extinguishing chamber and the circuit breaker base 10 and the upper cover 9 complete the position constraint of 6 degrees of freedom in space.
Fig. 5 is a top view of the arc extinguishing chamber, when the arc generated after the movable contact part and the fixed contact part are separated is subjected to the action of magnetic blow and air blow, the arc moves along the arrow direction as shown in the figure, the arc is continuously contacted with the insulating plastic part 11-1 in the moving process, and the shape of the insulating plastic part 11-1 is arranged, so that the distance A1 as shown in the figure is ensured to be smaller than the distance A2, the diameter of the arc column can be compressed, the arc voltage is improved, and the arc extinguishing performance is improved. As shown in fig. 5, the constricted surface is a curved surface, which reduces the resistance of the arc entering the arc chute.
In order to cut off the electric arc of higher voltage, consequently need place more arc extinguishing bars piece in the explosion chamber cavity, under the prerequisite that does not change the contact opening, can cause arc extinguishing bars piece utilization efficiency not high, consequently the utility model discloses increase the equipotential arc striking device emphatically, combine fig. 3, fig. 6, fig. 7 and fig. 8, the movable contact part and the fixed contact part of circuit breaker are at the separation back, produce electric arc between the sound contact, but because the effective opening range internal arc extinguishing bars piece 7 of stationary contact 51 and movable contact 41 is limited in quantity, there is the poor condition of arc striking effect at the bars piece that exceeds movable contact 41 top, consequently can improve the high efficiency that the arc extinguishing bars piece used through the equipotential arc striking device.
In fig. 6 and 7, there are two arc loops of the equipotential device, the first arc current loop is formed in the equipotential loop 2 after the contacts are separated, but with the movement of the moving contact 4, the electric field intensity between the moving contact 41 and the stationary contact 51 gradually decreases, when the distance between the moving contact 41 and the stationary contact 51 is L2 < L1, L1 is the minimum distance between the upper arc tab 6 and the lower arc tab 8, and the electric field intensity between the moving contact 41 and the stationary contact 51 is less than the electric field intensity between the upper arc tab 6 and the lower arc tab 8 in front, so the arc root of the arc turn is transferred to the upper and lower arc tabs to form the equipotential loop 1, and the voltage formed by the upper arc tab is equipotential with the outlet row 1, so the upper arc tab can establish a stronger electric field, thereby ensuring that the grid 7 above the moving contact 41 is used, and the design of L2 < L1 is favorable for the driven arc root, The static contact is transferred to the upper arc striking plate and the lower arc striking plate, so that the burning loss of the dynamic and static contacts is reduced, and the service life of the circuit breaker is prolonged.
As shown in fig. 11, the upper arc striking plate 6 includes a connecting portion 61, the connecting portion 61 is fixed above the uppermost plate of the arc extinguishing plate group 7, a first arc striking rod 62 is extended from one side of the connecting portion 61 to a lower side thereof, a second arc striking rod 63 is extended from an end portion of the first arc striking rod 62 in a reverse direction, and the first arc striking rod 62 and the second arc striking rod 63 form a "V" shape. The first arc starting lever 62 includes an upper lever 621 extending downward from one side of the connecting portion 61, a bent portion 622 connected to the upper lever 621 and having an angle with the end of the upper lever 621, and a lower lever 623 connected to the bent portion 622 and extending downward. A bend 622 is provided on the first arc runner 62 near the upper end of the arc chute group 7. A bulge 81 is arranged on the lower arc ignition sheet 8 at the position corresponding to the upper arc ignition sheet 6.
The upper arc striking plate 6 and the lower arc striking plate 8 are provided with a plurality of bending parts, and the outgoing electric field is concentrated at the bending part, so that the electric field intensity of the area grid plate can be increased, and the arc extinguishing performance is further improved.
After increasing equipotential device, connecting rod 3 can cause serious insulating problem to moulded case circuit breaker, has consequently increased equipotential device's the line of walking, combines fig. 9 and fig. 10, through set up trough 101 on base 10, lets conductive connecting rod 3 all bury in the groove, does not allow conductive connecting rod 3 to expose outside the casing to the insulating problem that consequently causes is solved.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it will be appreciated that those skilled in the art, upon attaining an understanding of the foregoing may readily produce alterations to, variations of, and equivalents to such embodiments without departing from the spirit and scope of the present invention as set forth in the appended claims.
Claims (7)
1. A circuit breaker with high arc extinguishing performance is characterized by comprising an arc extinguishing chamber, wherein an upper arc striking plate (6), a movable contact rod (4) and a connecting rod (3) are arranged in the arc extinguishing chamber; through connection, the upper arc striking plate (6) and the movable contact rod (4) form an equipotential circuit, one end of the connecting rod (3) is connected with the upper arc striking plate (6), and the connection point of the other end of the connecting rod is any part between the movable contact rod (4) and the circuit of the wire outlet row (1).
2. The circuit breaker with high arc-extinguishing performance according to claim 1, characterized in that the connecting rod (3) is a whole copper plate bent or two ends are copper plates, and the intermediate conductor is a flexible wire.
3. The circuit breaker with high arc-extinguishing performance according to claim 1, wherein the upper arc-striking plate (6) comprises a connecting portion (61), the connecting portion (61) is fixed above the uppermost grid plate of the arc-extinguishing grid plate group (7), a first arc-striking rod (62) is arranged along one side of the connecting portion (61) and extends downwards, a second arc-striking rod (63) is arranged along the opposite direction of the end portion of the first arc-striking rod (62), and the first arc-striking rod (62) and the second arc-striking rod (63) form a V shape.
4. The circuit breaker with high arc-extinguishing performance according to claim 1, further comprising a lower arc-striking plate (8), wherein the lower arc-striking plate (8) is provided with a protrusion (81) facing the upper arc-striking plate (6), the front end of the movable contact rod (4) is provided with a movable contact (41), and the movable contact rod (4) rotates upwards to open the brake, so that the minimum distance between the movable contact (41) and the fixed contact (51) is L2The minimum distance between the top end of the bulge (81) and the V-shaped lower end of the upper arc striking plate (6) is L1And L is2＜L1。
5. The circuit breaker with high arc-extinguishing performance according to claim 3, wherein the first arc-striking rod (62) comprises an upper rod (621) extending downward from one side of the connecting portion (61), a bent portion (622) connected to the upper rod (621) and having an angle with the end of the upper rod (621), and a lower rod (623) connected to the bent portion (622) and extending downward, and the bent portion (622) is disposed on the first arc-striking rod (62) near the upper end of the arc-extinguishing grid group (7).
6. The circuit breaker with high arc extinguishing performance according to claim 1, characterized in that the circuit breaker further comprises a base (10), a groove (101) is opened on a side wall of the base (10), and the connecting rod (3) is placed in the groove (101).
7. The circuit breaker with high arc extinguishing performance according to claim 3, wherein the number of arc extinguishing grid pieces in the arc extinguishing grid piece group (7) is 50-60.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120755583.4U CN214898283U (en) | 2021-04-12 | 2021-04-12 | Circuit breaker with high arc extinguishing performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120755583.4U CN214898283U (en) | 2021-04-12 | 2021-04-12 | Circuit breaker with high arc extinguishing performance |
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| Publication Number | Publication Date |
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| CN214898283U true CN214898283U (en) | 2021-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120755583.4U Active CN214898283U (en) | 2021-04-12 | 2021-04-12 | Circuit breaker with high arc extinguishing performance |
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| Country | Link |
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| CN (1) | CN214898283U (en) |
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2021
- 2021-04-12 CN CN202120755583.4U patent/CN214898283U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220601 Address after: 212132 No. 97, Wufengshan Road, Dagang, New District, Zhenjiang City, Jiangsu Province Patentee after: Huineng low voltage electric appliance (Jiangsu) Co.,Ltd. Address before: No.97, Wufengshan Road, Dagang, Zhenjiang New District, Zhenjiang City, Jiangsu Province Patentee before: Jiangsu Phono Electric Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220729 Address after: 212132 No. 97, Wufengshan Road, Dagang, New District, Zhenjiang City, Jiangsu Province Patentee after: Jiangsu Phono Electric Co.,Ltd. Address before: 212132 No. 97, Wufengshan Road, Dagang, New District, Zhenjiang City, Jiangsu Province Patentee before: Huineng low voltage electric appliance (Jiangsu) Co.,Ltd. |